[1] G.Bratbak.V iruses as part ners in spring bloom microbial t rophodynamics.Appl.En vi ron.M i cr obi ol,1990,57:2731-2734. [2] J.D ouglas.Bacteriophages.Chapman and Hall, London.1975. [3] J.J.Germida and L.E.Casida.Ensifer adhaerens predat ory activity against ot her bact eria in soil as mon it ored by indirect phage analysis.A ppl.En vi ron.M icrobi ol.,1983,45:1380-1388. [4] K.M oebus.Further invest igat ions on t he concen tration of marine bact eriophages in t he w at er around Helgoland,w ith reference t o t he phage-host sys tems encountered.H el gola nd.M eeresunt er, 1992,46:275-292. [5] P.M ash.Survival of t he temperat e phage C31 and St reptomyces lividans in soil and t he eff ect s of com pet it ion an d select ion on lysogens.FEM S M i crobi ol.Ecol.,1996,16:13-22. [6] T.A.K okjohn,G.S.Sayler and R.V.M iller.A t tachment and repl icat ion of bacteriophages under condit ions simulat ing aquat ic environment s.J. Gen.M i crobiol,1991,137:661-666. [7] L.M.Proct or.Calibrating estimates of phage in duced mortality in marine bact eria:ultrast ruct ural studies of marin e bact eriophage development from on estep grow t h experiments.M i crob.Ecol., 1993,25:161-182. [8] L.R.Zeph and G.St otzky.U se of biot inylat ed DN A probe t o det ect bacteria transduced by bacte riophage P1 in soil.App l.En vi ron.Mi crobiol, 1989,55:661-665.